Gresham, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

051
FXUS66 KPQR 021136
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
336 AM PST Mon Feb 2 2026

.SYNOPSIS...
Mainly dry and mild conditions are expected across the region
today, with periods of light rain confined to southwest
Washington and far northwest Oregon. Confidence remains high for
a prolonged stretch of dry weather and above-normal temperatures
from Tuesday through at least Friday as a strong upper-level
ridge builds over the Pacific Northwest. Uncertainty increases
toward next weekend regarding the eventual breakdown of the
ridge, though most guidance suggests precipitation may return by
late Saturday.

&&

.DISCUSSION...Now through Sunday...
A weak warm frontal boundary begins to lift northward across
southwest Washington and far northwest Oregon this morning,
bringing a period of light rain mainly north of a Lincoln City
to Portland line. Locations south of this corridor are likely to
remain dry, with probabilities of staying precipitation-free
ranging from 80 to 95%. Elsewhere, dry conditions prevail under
mild temperatures, with afternoon highs generally reaching the
mid 50s to lower 60s.

Beginning Tuesday, deterministic and ensemble guidance remains
in strong agreement that upper-level ridging becomes firmly
established over the Pacific Northwest. This pattern will
support an extended period of dry weather, above-normal
temperatures, and generally light winds through at least Friday.
One notable exception will be in the western Columbia River
Gorge and far eastern portions of the Portland and Vancouver
metro area, where increasing easterly pressure gradients will
lead to gusty winds, particularly Wednesday and Thursday.

Ensemble guidance suggests surface pressure gradients between
Troutdale and The Dalles will be around -5 to -7 mb during this
time, possibly peaking up to -8 mb. Under stable low-level
conditions, this setup would favor strong easterly winds through
the Gorge, with potential wind gusts reaching up to 70 mph near
Crown Point, 50 to 55 mph near Corbett, and 35 to 40 mph around
Troutdale. In a possibly stronger but less likely scenario
(peak of -8 mb), wind gusts could be an additional 10 mph
stronger than the aforementioned potential wind gusts. Overall,
these values (-7 and -8 mb) assume the stronger end of the
projected gradient range; weaker gradients would result in
correspondingly lower wind speeds. While some localized tree
damage and isolated power outages are possible, impacts are not
expected to be widespread.

Away from the Gorge, lighter winds and persistent ridging will
promote stagnant conditions, particularly across the central and
southern Willamette Valley. Calm winds and low mixing heights
persisting for several consecutive days may lead to gradual air
quality degradation. Forecast confidence is also lower regarding
sky cover and temperatures in these valley locations, as
inversion-driven low stratus and fog should be slow to clear,
resulting in cooler daytime temperatures compared to surrounding
higher terrain, the Coast Range, and the Cascades. That said,
guidance suggests improved clearing and greater sunshine
potential by late week, even within the central and southern
valley.

Forecast uncertainty increases heading into Saturday and
Sunday. Some model solutions maintain dry conditions under
lingering ridging, while others introduce precipitation as the
ridge begins to weaken. Current probabilities suggest a 20 to
40% chance of rain returning Saturday afternoon, and a 50 to
80% by late Saturday night. Regardless of the timing, rain will
likely continue through Sunday and into the start of next week.
~12

&&

.AVIATION...Currently a drastic mixed bag of VFR and LIFR
throughout the airspace as fog develops under clear skies in the
south Willamette Valley and somewhat develops in the rest of the
Valley under broken cloud cover. With a warm front approaching
the northern part of the airspace (generally north of a line
from KTMK and KUAO), conditions will vary by location. For the
northern part, any terminals with LIFR fog conditions should
improve back to MVFR/VFR by 14Z Monday as the front brings rain
and improved mixing. For terminals south of the aforementioned
line, the front will likely miss the area and LIFR fog
conditions will likely persist until 18Z Monday, then improve
to VFR thereafter. As for the coastal terminals, expect a mix of
VFR/MVFR CIGs through most of the TAF period, with the exception
of KAST more susceptible to IFR conditions after 18Z Monday
(20-30% chance of IFR conditions). Around 06-09Z Tuesday,
clearing skies and wet ground will again bring the potential for
LIFR fog at most inland terminals. Otherwise, expect generally
southerly to southeasterly winds between 5-10 kt throughout the
airspace, with the exception of gusts up to 20-25 kt at KAST
between 18-23Z Monday.

KPDX AND APPROACHES...A weak frontal system moves northeastward
towards southwest Washington, bringing the potential for rain at
the terminal between 15-23Z Monday. In the meantime, there is a
10-20% chance for deteriorated conditions as fog tries to
develop near the terminal (recent obs of LIFR and MVFR). When
the front arrives and provides rain and mixing, expect mostly
VFR CIGs with a 10-20% chance of MVFR CIGs through most of the
TAF period. Around 06-09Z Tuesday, clearing skies and wet ground
will bring another chance for fog formation.
~12

&&

.MARINE...
A weak front moves northeasterly through the waters between Cape
Shoalwater and Cape Falcon this morning, bringing increased
south winds with gusts 20 to 25 kts. Winds will decrease below
20 kts again late today and remain 5 to 10 kt through the rest
of the week. Expect wave heights of 10 to 13 feet at 11 to 13
seconds through this evening. Due to a combination of winds and
seas, a Small Craft Advisory is in effect through 1 AM PST on
Tuesday. High pressure builds over the waters Tuesday with
southerly winds less than 10-15 kts and seas less than 10 ft.
By Wednesday, an increasing westerly swell is forecast to push
into the waters, increasing seas to around 10-12 feet around
12-16 seconds through the end of the week.
-12/03

&&

.BEACH HAZARDS...
A long period westerly swell will result in a high threat for
sneaker waves persisting through this afternoon. Waves can run
up significantly farther on a beach than normal, including over
rocks and jetties. Sneaker waves can suddenly knock people off
of their feet and quickly pull them into the frigid ocean which
may lead to serious injury or drowning. Caution should be used
when in or near the water, especially those who will be razor
clamming this week. -42

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory until 1 AM PST Tuesday for PZZ210-251>253-
     271>273.
&&

$$

www.weather.gov/portland

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